CN101457131B - Water binding agent for lithium ionic cell electric pole material and preparation method thereof - Google Patents
Water binding agent for lithium ionic cell electric pole material and preparation method thereof Download PDFInfo
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- CN101457131B CN101457131B CN2009103001503A CN200910300150A CN101457131B CN 101457131 B CN101457131 B CN 101457131B CN 2009103001503 A CN2009103001503 A CN 2009103001503A CN 200910300150 A CN200910300150 A CN 200910300150A CN 101457131 B CN101457131 B CN 101457131B
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Abstract
The present invention relates to an aqueous binder used in lithium ionic cell electric pole material and the preparation method thereof, which belongs to lithium ionic cell electric pole material preparation field. The present invention aims to provide an aqueous binder for producing lithium ionic cell positive and negative plate with adjustable flexibility, and can meet all electric pole material aqueous binder requirements under various conditions of lithium ionic cell production and processing, storage and usage. The aqueouspolymer latex particle emulsion has an inside soft and outside hard core-shell structure with low polar polymer as core and high polar polymer as shell, and the solid content of the emulsion is 5-40 wt%, the mass percentage of low polar polymer is more than 0 and smaller than or equal to 95% in the core-shell structure. The lithium ionic cell produced according to the invention is provided with high capacity exertion of electroactive material, long battery periodic duty life and high voltage of discharge platform.
Description
Technical field
The present invention relates to a kind of water binding agent for lithium ionic cell electric pole material and preparation method thereof, belong to the lithium ion battery electrode material preparation field.
Background technology
Lithium ion battery is through the development of more than two decades, for example mobile telephone, laptop computer, pick up camera, photographic camera, word processor etc. are extended to various large-scale energy supply systems, for example electric vehicle, space flight and aviation, military affairs, buildings stand-by power source system etc. to its range of application gradually from portable electronics; The lithium ion battery plus-negative plate material is meal, comprise positive active material and various carbon element negative materials such as cobalt system, nickel system, manganese system, iron lithium phosphate, Co-Ni-Mn ternary material, need to add tackiness agent hybrid modulation form slurry, coat as the electrode slice that is prepared into battery on the Copper Foil of current collector and the aluminium foil.The effect of tackiness agent is to become an integral body powder material, conductive agent and metal current collector are inter-adhesive; Existing market has multiple tackiness agent to be used for lithium ion battery, as SBR/CMC, Fluorine containing olefine polymkeric substance etc.
For example; Having introduced among the Japanese patent laid-open 7-220722 and having adopted the N-Methyl pyrrolidone solution of polyvinylidene difluoride (PVDF) is that tackiness agent, lithium nickel oxide are that electroactive substance, synthetic graphite are conductive agent, be processed into slurry by ball milling by a certain percentage, coat on the aluminium foil, roll after drying and make the pellet electrode blank, obtain anode electrode sheet finished product after 200 ℃ of heating clinkerings were handled 1 hour.Having announced with the Fluorine containing olefine polymkeric substance among the flat 7-78057 of Japanese patent laid-open 7-78056 and Te Kai, is the plain patent of making lithium ion battery carbon element negative plate for active material of tackiness agent, KETJEN charcoal as polyvinylidene difluoride (PVDF) solution.Chinese invention patent ZL01108511.8, ZL01108524.X have introduced a kind of manufacture method of soap-free emulsion aqueous binder.With the Fluorine containing olefine polymers soln is the tackiness agent of lithium ion battery electrode material, and in electrode slice making processes, the volatilization of adhesive solvent is contaminate environment both, endangers operator ' s health again; The solvent of dry evaporation must be collected and be handled with special refrigerating apparatus; Fluoropolymer and solvent thereof cost an arm and a leg in addition, have increased the production cost of lithium ion battery undoubtedly.
In order to address the above problem, people also research and development water adhesive of lithium ion battery, as vinylformic acid-styrene polymer, vinylformic acid-silicon-oxygen polymer, cinnamic acrylic ester polymkeric substance (JP2000294230); Styrene butadiene polymkeric substance (JP2000106198); Butadiene-acrylonitrile polymer waterborne polymeric latex such as (EP100905).Through application verification for many years, SBR/CMC water-based latex tackiness agent obtains the market approval substantially, but SBR/CMC easy roll banding in the course of processing, and being difficult to use in the positive plate preparation, use range is restricted.
The present inventor has studied the aqueous copolymer that the monomer copolymerization by two or more opposed polarity forms in Chinese patent ZL 01108524.X and ZL 01108511.8 be that tackiness agent is used to prepare the lithium ion cell electrode sheet, environmentally friendly, can solve polyvinylidene difluoride (PVDF) equal solvent type tackiness agent to the pollution of environment with influence the healthy problem of producers.But this aqueous binder snappiness deficiency.
Summary of the invention
Technical problem to be solved by this invention is: a kind of new type lithium ion battery electrode materials use tackiness agent is provided, and environmentally friendly, can solve polyvinylidene difluoride (PVDF) equal solvent type tackiness agent to the pollution of environment with influence the healthy problem of producers.Have adjustable snappiness simultaneously, can adapt to the requirement of various condition counter electrode material aqueous binders such as lithium ion battery process for processing, storing use.
Technical scheme of the present invention:
It is to be that nuclear core, high polar polymer are shell by low polar polymer, the aqueous polymer emulsion of soft outer hard nucleocapsid structure in forming, wherein, in nuclear-shell or the sandwich type structure, hang down the shared amount per-cent of polar polymer greater than 0 smaller or equal to 95%; Described high polar polymer is to be formed by one or more hydrophilic monomers and one or more lipophilicity monomer copolymerizations.This emulsion solid content is 5～40wt%, and is good with 10～20%.
In described nuclear-shell or the sandwich type structure, the low polar polymer of nuclear core segment can be at least a in isoprene-isobutylene rubber, ethylene propylene rubber, terpolymer EP rubber, paracril, styrene-butadiene rubber(SBR), polyhutadiene, polyisobutene, ABS, SBS, polyacrylic ester, chloroprene rubber, polyvinyl acetate (PVA), the ethylene-vinyl acetate copolymer etc.Wherein, the commercially available prod is the glue lactous can directly use, and the polymkeric substance of other states can adopt the conventional preparation method (dissolving, emulsification, desolventizing) of artificial latex, uses after being transformed into corresponding latex.
In described nuclear-shell or the sandwich type structure, the high polar polymer of shell part is formed by the monomer copolymerization of two or more opposed polarity, its molecular chain has high polarity hydrophilic-structure unit and low polarity oleophylic structural unit simultaneously, corresponding comonomer is divided into hydrophilic monomer and lipophilicity monomer two classes by polarity, polyreaction need be used two class monomers simultaneously, the monomeric weight ratio of hydrophilic monomer and oleophylic is 5～90: 95～10, and every class monomer can be a kind of monomer or multiple monomeric mixture.
The hydrophilic monomer structural formula is: CHR
1=CR
2R
3, wherein,
R
1=-H ,-CH
3Or-COOLi;
R
2=-H ,-CH
3Or-COOLi;
R
3＝-COOLi、-CH
2COOLi、-COO(CH
2)
6SO
3Li、-CONH
2、-CONHCH
3、-CONHCH
2CH
3、-CON(CH
3)
2、-CON(CH
2CH
3)
2。
The lipophilicity monomer structure is: CH
2=CR
1R
2(R
1=-H or-CH
3, R
2=-C
6H
5,-OCOCH
3,-COOCH
3,-COOCH
2CH
3,-COOCH
2CH
2CH
2CH
3,-COOCH
2CH (CH
2CH
3) CH
2CH
2CH
2CH
3,-CN etc.).
The preparation method of water binding agent for lithium ionic cell electric pole material of the present invention is:
A, will place reaction vessel as the distilled water or the deionized water of dispersion medium earlier, start stirring, 20～300 rev/mins of stirring velocitys, add synthetic required hydrophilic monomer, the stirring and dissolving of shell multipolymer, conditioned reaction liquid pH to 8～9 add pH buffer reagent (as Quilonum Retard), frostproofer auxiliary agent stirring and dissolving such as (as ethylene glycol) then, mix;
B, add the low polar polymer emulsion as the nuclear core, feed rare gas element (high pure nitrogen) and drove oxygen 0.5～2 hour, it is monomeric partly or entirely to add the synthetic required lipophilicity of shell polymkeric substance then;
C, be warming up to 30～85 ℃ and constant temperature, add initiator solution and begin polyreaction under nitrogen atmosphere, drip between the reaction period or initiator and remaining lipophilicity monomer are added in gradation, the reaction times is 5～30 hours, the degassing, filters promptly.
In the above-mentioned method for preparing the lithium ion battery electrode material aqueous binder, the described low polar polymer of its nuclear core segment of latex particle with nuclear-shell or sandwich type structure can be at least a in isoprene-isobutylene rubber, ethylene propylene rubber, terpolymer EP rubber, paracril, styrene-butadiene rubber(SBR), polyhutadiene, polyisobutene, ABS, SBS, polyacrylic ester, chloroprene rubber, polyvinyl acetate (PVA), the ethylene-vinyl acetate copolymer; As the nuclear core polymkeric substance of aqueous binder of the present invention preparation, the commercially available prod is the glue lactous can directly use, and the polymkeric substance of other states can adopt the conventional preparation method (dissolving, emulsification, desolventizing) of artificial latex, uses after being transformed into corresponding latex.
In the above-mentioned method for preparing the lithium ion battery electrode material aqueous binder, the described high polar polymer of latex particle shell part with nuclear-shell or sandwich type structure is formed by two kinds of monomer copolymerization on the throne in the water dispersion medium of above-mentioned nuclear core latex with two or more opposed polarities, its molecular chain has high polarity hydrophilic-structure unit and low polarity oleophylic structural unit simultaneously, corresponding comonomer is divided into hydrophilic monomer and lipophilicity monomer two classes by polarity, polyreaction need be used two class monomers simultaneously, the monomeric weight ratio of hydrophilic monomer and oleophylic is 5～90: 95～10, and every class monomer can be a kind of monomer or two kinds to multiple similar monomeric mixture.Said latex particle shell polymkeric substance synthetic hydrophilic monomer structural formula is CHR
1=CR
2R
3(R
1=-H ,-CH
3Or-COOLi, R
2=-H ,-CH
3Or-COOLi, R
3=-COOLi ,-CH
2COOLi ,-COO (CH
2)
6SO
3Li ,-CONH
2,-CONHCH
3,-CONHCH
2CH
3,-CON (CH
3)
2,-CON (CH
2CH
3)
2).Said latex particle shell polymkeric substance synthetic lipophilicity monomer, its structure is: CH
2=CR
1R
2(R
1=-H or-CH
3, R
2=-C
6H
5,-OCOCH
3,-COOCH
3,-COOCH
2CH
3,-COOCH
2CH
2CH
2CH
3,-COOCH
2CH (CH
2CH
3) CH
2CH
2CH
2CH
3,-CN etc.).Said initiator system is water soluble starter and and Na thereof such as ammonium persulphate, Potassium Persulphate, hydrogen peroxide, azo two NSC 18620
2SO
3, FeSO
4Deng the redox initiation system that constitutes.With the range of solid content 5～40% of the resulting lithium ion battery electrode material aqueous binder of above-mentioned preparation method (weight percentage, down with), and be good with 10～20%; 5～30 hours reaction times was good with 5～12 hours.30～85 ℃ of temperature of reaction are good with 40～70 ℃ again.Initiator amount then accounts for 0.1～0.7% of total monomer weight.
The electrode materials that the lithium ion battery electrode material aqueous binder is suitable among the present invention is coke, natural graphite, synthetic graphite, MCMB, LiCoO
2, LiNiO
2, LiMnO
2, LiFePO
4, CoNiMn tertiary cathode material etc.In the electrode slice of making, the content of aqueous binder is 1～8%, is good with 1.5～5%.
In the aqueous binder of the present invention, the polymkeric substance of the strong cohesive force of high polarity for tackiness agent provides good sticking power, makes electroactive material, inter-adhesive and firm being attached on the current collector of conductive agent particle as the shell of adhesive latex particle.The low flexible polymkeric substance of polarity is as adhesive latex particle core core, for the tackiness agent glued membrane provides enough processing snappinesies.
When the low shared per-cent of polar polymer of softish increased to 95% by 0, the flexibility of tackiness agent glued membrane increased gradually, and final flexibility near nuclear core polymkeric substance; Simultaneously, because the outer cover polymer ratio of strong cohesive force reduces, the cohesive force of tackiness agent will reduce; But in the tackiness agent film process, because the polymkeric substance migration slowly, the outer cover polymer of strong cohesive force preferentially occupies the bonding point position, so in the aforementioned proportion scope, along with the increase of flexible polymer ratio, the cohesive force of tackiness agent counter electrode material and current collector only slightly reduces.By the adjustment of this ratio, can obtain the aqueous binder of different snappinesies and cohesive force.Different lithium ion battery electrode materials has different requirements with complete processing snappiness to tackiness agent in electrode slice is made, carbon element negative material such as general coke, natural graphite, synthetic graphite, MCMB and stacked complete processing require low to the tackiness agent snappiness and cohesive force are required high, and the ratio of flexible polymer is good with 0～30% in the tackiness agent; LiCoO
2, LiNiO
2, LiMnO
2, LiFePO
4, positive electrode material such as CoNiMn ternary material and spirally wound complete processing require highly to the tackiness agent snappiness, the ratio of flexible polymer is good with 50～85% in the tackiness agent.
In addition, the polymkeric substance of two kinds of opposed polarities in the film forming forms the crazing micropore because internal cohesive energy and inotropic difference produce " crazing " effect, can reduce lithium ion transport migration resistance in the electrode slice.
Beneficial effect of the present invention:
The present invention takes all factors into consideration factors such as lithium ion battery production and processing technology, inside battery electrochemical environment; designed a kind of composite junction configuration polymer latex as water adhesive of lithium ion battery; replace in the present lithium ion battery process industry polyvinylidene difluoride (PVDF) equal solvent type tackiness agent that generally uses; to solve organic solvent healthy to the pollution of environment and protection producers, satisfy the requirement of condition counter electrode material aqueous binders such as lithium ion battery process for processing, storing use simultaneously.
Embodiment
Below by the more specifically detailed description of indefiniteness embodiment, will help understanding of the present invention, protection scope of the present invention is not subjected to the qualification of these embodiment, and protection scope of the present invention is decided by claim.
The lithium ion battery production technique that adopts water adhesive for lithium ion battery of the present invention all to be familiar with by industry technician is made the lithium ion battery positive and negative plate and is assembled into the aluminum plastic film flexible-packed battery and carries out the charge-discharge test investigation, and its making processes is as follows:
A. will be diluted to 1 part of 2～10% aqueous binder mixes with 0.98～0.90 part of carbon element negative material, 0～0.05 part of conductive agent, fully stir and be uniform sizing material, be uniformly coated on after filtering on the clean Copper Foil, the oven dry grinding compacting promptly obtains the negative electricity pole piece.
B. will be diluted to 1 part of 1～10% aqueous binder and be mixed into slurry with 0.96～0.85 part of positive electrode material, 0.02～0.10 part of conductive additive, and be uniformly coated on after filtering on the clean aluminium foil, the oven dry compacting obtains the anode electrode sheet.
C. cut the electrode slice that makes certain area, in vacuum-drying under 100 ± 20 ℃ the temperature after 24 hours, place the glove box of dry argon gas atmosphere, with Celgard C200 is that battery diaphragm is assembled into lithium-ion electric core, injection electrolytic solution seals, and changes into, discharges and recharges, performance test such as cycle life.
The preparation of embodiment 1 lithium ion battery electrode material aqueous binder of the present invention
In the present embodiment with the nuclear core of isoprene-isobutylene rubber as the aqueous binder latex particle, outer cover polymer was pressed 2: 1: 2 by hydrophilic monomer vinylformic acid lithium, acrylamide and oleophylic monomers methyl methacrylate, vinyl cyanide: the copolymerization on the throne in the isoprene-isobutylene rubber emulsion of 5 part by weight forms, synthetic aqueous binder core-shell polymer weight ratio is 81: 19, effective content 20% is emulsion state.
The above-mentioned method for making that is used for the aqueous binder of lithium-ion secondary cell is:
Earlier isoprene-isobutylene rubber is dissolved in and is mixed with 15% solution in the hexanaphthene; It is 5% the aqueous solution that LiOH is mixed with concentration, get a certain amount of stearic acid, add in the isoprene-isobutylene rubber glue with 5% the LiOH solution for preparing, be heated to about 80 ℃, emulsification is 3 hours in the high speed shear Mixingemulsificationmachine, it is about 8～9 to adjust the pH value, removes the solvent hexanaphthene, concentrates and promptly make the isoprene-isobutylene rubber emulsion, and yield is more than 75%;
In reaction vessel, add 180 parts of distilled water, 4 parts of vinylformic acid lithiums, 2 parts of acrylamides, start stirring, 88 rev/mins of rotating speeds, after the solids dissolving evenly, adding is as the Quilonum Retard solid (making it reach 0.005M) of buffer reagent, with ethylene glycol auxiliary agents such as (making it reach 1wt%) as frostproofer, after treating the solids dissolving, add aforementioned isobutylene-isoprene latex (80 parts of isoprene-isobutylene rubbers), appraise and decide and adjust reaction solution pH to 8～9, logical high pure nitrogen drove oxygen 1 hour, added 4 parts of lipophilicity monomers methyl methacrylate, 10 parts of vinyl cyanide, heat temperature raising to 70 ℃ and constant temperature, add initiator solution then and begin reaction under nitrogen atmosphere, gradation is added initiator to improve reaction conversion ratio between the reaction period, reacts after 12 hours and finishes; After the degassing, filtration, technical parameter adjustment, make a kind of aqueous binder of the lithium ion battery electrode material of mentioned component.
The preparation of embodiment 2 lithium ion battery electrode material aqueous binders of the present invention
The method for making and the operational condition of present embodiment tackiness agent are substantially the same manner as Example 1, only different is as the isoprene-isobutylene rubber consumption of aqueous binder latex granule daughter nucleus core is 60 parts, shell polymkeric substance synthon vinylformic acid lithium, acrylamide, methyl methacrylate, vinyl cyanide consumption are respectively 8 parts, 4 parts, 8 parts, 20 parts, gained aqueous binder nuclear-shell weight ratio is 62: 38, effective content 15% is emulsion state.
The preparation of embodiment 3 lithium ion battery electrode material aqueous binders of the present invention
The method for making and the operational condition of present embodiment tackiness agent are substantially the same manner as Example 2, only be not both, isoprene-isobutylene rubber consumption as aqueous binder latex granule daughter nucleus core is 4 parts, shell polymkeric substance synthon vinylformic acid lithium, acrylamide, methyl methacrylate, vinyl cyanide consumption are respectively 19.2 parts, 9.6 parts, 19.2 parts, 48 parts, gained aqueous binder nuclear-shell weight ratio is 5: 95, effective content 15% is emulsion state.
The preparation of embodiment 4 lithium ion battery electrode material aqueous binders of the present invention
The method for making and the operational condition of present embodiment tackiness agent are substantially the same manner as Example 2, only be not both, and be terpolymer EP rubber as the polymkeric substance of aqueous binder latex granule daughter nucleus core.
The preparation of embodiment 5 lithium ion battery electrode material aqueous binders of the present invention
The method for making and the operational condition of present embodiment tackiness agent are substantially the same manner as Example 2, only be not both, and be styrene-butadiene rubber(SBR) as the polymkeric substance of aqueous binder latex granule daughter nucleus core, the raw material SBR emulsion is the commercial goods, need not make specially.
Embodiment 6 adopts the lithium ion battery performance of aqueous binder preparation of the present invention
With LiCoO
2, LiMn
2O
4And LiFePO
4Be positive electrode material, synthetic graphite is a negative material, the emulsion that embodiment 1～embodiment 5 obtains is a tackiness agent, makes the lithium ion battery positive and negative plate and is assembled into the aluminum plastic film flexible-packed battery by all familiar lithium ion battery production technique of industry technician and carry out the charge-discharge test investigation.With identical condition prepared PVDF be tackiness agent lithium ion battery as a comparison case.The lithium ion battery The performance test results of various tackiness agents is as shown in table 1:
The charge-discharge performance parameter of all kinds of batteries of table 1 and circulation volume conservation rate
| Just/negative material | Just/the negative pole tackiness agent | Anodal gram volume performance mAh | Threshold voltage V in the battery | 100 times capacity keeps (%) | 200 times capacity keeps (%) | 300 times capacity keeps (%) |
| LiCoO 2/C | PVDF/ PVDF | 141 | 3.790 | 97.6 | 95.7 | 93.2 |
| LiCoO 2/C | Embodiment 2/ embodiment 3 | 144 | 3.797 | 97.8 | 96.1 | 94.4 |
| LiMn 2O 4/C | Embodiment 1/ embodiment 3 | 109 | 3.840 | 95.8 | 93.3 | 91.0 |
| LiFePO 4/C | Embodiment 4/ embodiment 5 | 132 | 3.405 | 98.6 | 95.4 | 93.6 |
Table 1 result shows, adopts the lithium ion battery of aqueous binder preparation of the present invention to have electroactive material capacity performance height, battery to recycle the life-span long, characteristics such as discharge platform voltage height.
Aqueous binder of the present invention by the adjustment of core-shell polymer ratio, can synthesize the composite adhesive series product of different snappinesies and cohesive force; Those skilled in the art can select the different product of core-shell polymer ratio in the tackiness agent according to battery complete processing and electrode used therein material, adjust the processing snappiness of tackiness agent, to adapt to its battery plate complete processing.
Claims (7)
1. water binding agent for lithium ionic cell electric pole material, it is characterized in that: it is to be that nuclear core, high polar polymer are shell by low polar polymer, the soft emulsion of the waterborne polymeric latex particle of hard nucleocapsid structure outward in forming, this emulsion solid content is 5～40wt%; Wherein, in the nucleocapsid structure, the shared amount per-cent of low polar polymer greater than 0 smaller or equal to 95%;
Described high polar polymer is to be formed by one or more hydrophilic monomers and one or more lipophilicity monomer copolymerizations, and the monomeric weight ratio of hydrophilic monomer and lipophilicity is 5～90: 95～10; Wherein,
Described hydrophilic monomer structural formula is:
CHR
1＝CR
2R
3，
R
1=-H ,-CH
3Or-COOLi;
R
2=-H ,-CH
3Or-COOLi;
R
3＝-COOLi、-CH
2COOLi、-COO(CH
2)
6SO
3Li、-CONH
2、
-CONHCH
3、-CONHCH
2CH
3、-CON(CH
3)
2、
-CON(CH
2CH
3)
2；
Described lipophilicity monomer structure is: CH
2=CR
1R
2,
R
1=-H or-CH
3
R
2＝-C
6H
5、-OCOCH
3、-COOCH
3、-COOCH
2CH
3、
-COOCH
2CH
2CH
2CH
3、-COOCH
2CH(CH
2CH
3)CH
2CH
2CH
2CH
3
Or-CN.
Described low polar polymer is at least a in isoprene-isobutylene rubber, ethylene propylene rubber, terpolymer EP rubber, paracril, styrene-butadiene rubber(SBR), polyhutadiene, polyisobutene, ABS, SBS, polyacrylic ester, chloroprene rubber, polyvinyl acetate (PVA), the ethylene-vinyl acetate copolymer.
2. water binding agent for lithium ionic cell electric pole material according to claim 1 is characterized in that: the shared amount per-cent of low polar polymer greater than 0 less than 30%.
3. water binding agent for lithium ionic cell electric pole material according to claim 1 is characterized in that: the low shared amount per-cent of polar polymer is 50～85%.
4. the preparation method of water binding agent for lithium ionic cell electric pole material is characterized in that being finished by following steps:
A, will place reaction vessel as the distilled water or the deionized water of dispersion medium earlier, 20～300 rev/mins of stirring velocitys add the synthetic required hydrophilic monomer dissolving of shell multipolymer, conditioned reaction liquid pH to 8～9, add pH buffer reagent, frostproofer, stirring and dissolving, mix;
B, add the low polar polymer emulsion as the nuclear core, feed rare gas element and drove oxygen 0.5～2 hour, it is monomeric partly or entirely to add the synthetic required lipophilicity of shell polymkeric substance then;
C, be warming up to 30～85 ℃ and constant temperature, under inert atmosphere, add initiator solution and begin polyreaction, initiator and remaining lipophilicity monomer are added in dropping or gradation between the reaction period, reaction times is 5～30 hours, the soft aqueous polymer emulsion of hard nucleocapsid structure outward in the degassing, filtration promptly get and form; Wherein,
Described hydrophilic monomer structural formula is:
CHR
1=CR
2R
3, wherein,
R
1=-H ,-CH
3Or-COOLi;
R
2=-H ,-CH
3Or-COOLi;
R
3＝-COOLi、-CH
2COOLi、-COO(CH
2)
6SO
3Li、-CONH
2、
-CONHCH
3、-CONHCH
2CH
3、-CON(CH
3)
2、
-CON(CH
2CH
3)
2；
Described lipophilicity monomer structure is: CH
2=CR
1R
2, wherein,
R
1=-H or-CH
3
R
2＝-C
6H
5、-OCOCH
3、-COOCH
3、-COOCH
2CH
3、
-COOCH
2CH
2CH
2CH
3,-COOCH
2CH (CH
2CH
3) CH
2CH
2CH
2CH
3Or-CN;
The latex that described low polar polymer emulsion is at least a polymkeric substance in isoprene-isobutylene rubber, binary or terpolymer EP rubber, paracril, styrene-butadiene rubber(SBR), polyhutadiene, polyisobutene, ABS, SBS, polyacrylic ester, chloroprene rubber, polyvinyl acetate (PVA), the ethylene-vinyl acetate copolymer;
The shared amount per-cent of low polar polymer greater than 0 smaller or equal to 95%; The aqueous polymer emulsion solid content of gained nucleocapsid structure is 10～20wt%.
5. according to the preparation method of the described water binding agent for lithium ionic cell electric pole material of claim 4, it is characterized in that: said initiator is ammonium persulphate, Potassium Persulphate, hydrogen peroxide, azo two NSC 18620 or itself and Na
2SO
3, FeSO
4The redox initiation system that constitutes.
6. lithium ion cell electrode sheet, it is characterized in that: it is aqueous binder and the electrode materials hybrid modulation form slurry that adopts each described aqueous binder of claim 1～3 or adopt claim 4 or 5 described preparation methods to be prepared from, coat that drying forms on the current collector, the content of aqueous binder is 1～8%wt.
7. lithium ion cell electrode sheet according to claim 6 is characterized in that: the content of aqueous binder is 1.5～5%wt.
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| CN102306788B (en) * | 2011-08-05 | 2016-01-20 | 东莞新能源科技有限公司 | The binding agent of a kind of lithium ion battery and negative pole and the use of this negative pole |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110591613A (en) * | 2019-09-07 | 2019-12-20 | 河南平煤国能锂电有限公司 | Binder for lithium ion battery cathode and preparation method thereof |
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